Tire



I. HOBSON AND E. E. GILBERT.

TIRE.

APPLICATION FILED MAR. 30| 1920.

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Be it known that we, JosErH l-losoN and ELMER E. GILBERT', citizens ofthe United States of America,` residing at-Colton, in the county of SanBernardino and Stateof California, have invented certain new andgusefulImprovements in Tires; and We do,l hereby dec exact description of theinvention, such as will enable others skilled inthe art to which itappertains to make and use the same.

This invention relates to new and useful improvements in tires and hasfor its primary tain novel features of constructiomcombina-` tion andarrangement of parts as Will be hereinafter more fully' described andclaimed.

For a complete understanding of our invention reference is tobe had tothe following description and accompanying'drawing, in which: i

Figure l is a sectional View, illustrating a tire constructed inaccordance with our 1nvention and showing the carborundum employed as atread;

Figure 2 is a fragmentary` plan View illustrating the same;y l Figure 3is a transverse sectlonal view illustrating a modified form of theinvention in which the tire is treaded with rubber;

Figure 4C is a similar view illustrating another modified form of ourinvention -in which the carborundum is 'mixed withthe rubber during therefining process thereof.

Referring in detail to the drawing, the

numeral 1 indicates the carcass of a pneu-l matic ltire or shoe which isbuilt up of layers i of rubberized fabric in the desired manner. y Aplurality of plies of carborundum cloth 2,

or fabric with carborundum cemented thereto, are placed one on the otherand thoroughly cemented together to form a strong and durable tread 3which is placed onor c emented to the carcass 1. The plies 2 Vary inwidth so asto provide the thickest part of the tread at the crest of thetire. The edges are the following to be a full, clear, andl speeiaoationof Lettersratent. Patented Apr. itil, 1922. i Application-filed March30, 1920. Serial No. 369,868.

of the plies 2 are covered by rubber 4 which is cemented orotherwiselsecured lthereto for preventing dirt .and other foreign`matter from Working between the plies and thus eventually causingloosening 'of the tread. 'It is to be noted that the carborundum clothor fabric forms the Wearing surface or face yof the tire, and owing toits wearing quality the life of the tire is immensely lengthened overother tires, and also the plurality of plies of the carborundum cloth orfabric provides a tread that the passing of nails and the liketherethrough is obviated thereby decreasing punctures to the pneumatictube. The carborundum has a tendency to vcut or' wear anything coming incontact therewith thus it will prevent skidding or' slipping as it willeut or grind the surface of the roadway. The carcass 2 may ,be of a newtire or the plies of carborundum cloth or fabric may be applied to anold carcass, of which the tread has been removed.

Referring to our modified form of invention, as shown in Figure 3, theplies of carborundum cloth or fabric 5 are secured to thecarcass 6 and atread 7 of rubber is p1aced`thereover and subjected to a vulcanizingprocess so that the plies of carborundum cloth or fabric are disposedbe- L tween the tread and the carcass to form an internal armor andafter the tread is worn off the carborundum cloth then assumes the wearthus providing a tire of a long wearing quality.

Referring to Figure 4, we have shown the c tread 8 constructed fromlrubber in which is embedded carborundum so as to increase the wearingqualities of the rubber as well as increasing the 'traction ofthe rubberon wet pavements or roadways. The carborundum is mixed with the rubberduring the refining process of said rubber so that the rubber becomesthoroughly impregnated with the carborundum.

While we have shown and described the preferred embodiment of ourinvention it resistingr grit, said layers being secured together and tothe outer surface of the carcass with sidesbearing the grit dispbsedoutwardly` said layers gradually decreasing in width from the carcassoutwardly, and rubber strip means secured over the sideedges of saidlayers and to the sides of said carcass inwardly of the layers, saidrubber strip.means sealing the side edges of said

